Brush or collector for electrical machines.



E. GINDRE.

BRUSH 0R COLLECTOR FOR ELECTRICAL MACHINES- APPLICATION FILED IULY 25, I913.

1,138,746. Patented May 11,1915.

'ORRIS PETERS C0,, PHOTD-LITHQ. WASHINGTON. l) c.

UNITED STATES PATENT OFFICE.

EUGENE GINDRE, OF PARIS, FRANCE, ASSIGNOR TO SOCIETE ANONYIVIE LE CARBONE, 0F LEVALLOIS-IE'ERRET, NEAR PARIS, FRANCE.

BRUSH OR COLLECTOR FOR ELECTRICAL IVIACHINES.

Application filed July 25, 1913.

To all whom it may COYweWL:

' Be it known that I, EUGENE .GINDRE, a citizen of the Republic of France, residing at 18 Rue de Berlin, Paris, in the Republic of France, have invented certain new and useful Improvements in or Relating to Brushes or Collectors for Electrical Machines, of which the following is a specification.

This invention relates to brushes or collectors for electrical machines; the chief object being to improve the electrical connection in such devices whereby the electrical resistance is reduced to a minimum.

In connection with certain electrical machines it is customary to effect the connection of the flexible conductor or cable with the carbon brush or collector by means of a yoke or saddle piece secured to the brush or collector. This saddle or yoke piece usually comprises a strip or band of metal bent so as to conform to the contour of the brush. The saddle piece for this purpose approxi mates a U-form the ends being secured to the sides of the brush by means of screws or otherwise. This construction presents cer tain disadvantages and prominently amongst the same is the fact that the securing of the aforesaid end pieces causes the central portion to bulge or flex so that it is not in contact with the surface of the carbon brush, thereby increasing the electrical resistance between the parts. The present inventionis designed to overcome these objections and to this end the yoke or saddle piece is formed with corrugations ribs or folds at or near the angles formed by the end portions and the central portion which seats upon the surface of the brush or collector. By means of these corrugations the central portion is enabled to take a firm and close seating upon the carbon brush when the end portions are secured in position on the said brush. Thus the electrical resistance is reduced to a minimum, the connection or contact of the saddle or yoke piece with the brush being of an intimate character.

The conductor or cable which is usually of a flexible character may be connected with the yoke or saddle piece in any convenientv manner but the methods hereinafter described olfer certain advantages.

In order that the said invention may be clearly understood and readily carried into Specification of Letters Patent.

Serial No. 781,054.

effect I will proceed to describe the same more fully with reference to the accompany"- ing drawings, in which Figures 1, 2 and 3 are respectively a longitudinal section, a transverse section and a plan illustrating a carbon brush provided with a saddle piece according to this invention. Fig. 4: is a view showing one mode of connecting the cable or conductor with the saddle piece. Figs. 5 and 6 illustrate another method of connection between the cable or conductor and the saddle piece. Figs. 7 and 3 show a manner of constructing the yoke or saddle piece and connector for the cable or conductor integrally; Fig. 7 illustrating a blank adapted for being suitably bent into shape and Fig. 8 the saddle piece applied to the carbon brush and having the cable secured in the socket formed by the metal of the blank.

The saddle piece is constituted by a body portion at having depending end portions Z) Z). The said saddle piece is formed with corrugations, ribs or folds 0 at or near the angles formed by the end portions Z) and the central or body portion a. The springy character imparted to the saddle piece by means of the parts 0 has the eflect of causing the portion a to seat firmly and closely upon the carbon brush cl when the end portions 6 are secured in position thereon; the electrical resistance being reduced to a minimum, owing to the intimate connection or contact existing between the parts. The saddle piece may be secured to the brush 0? by screws, pins or the like as at e, or by threading a tubular or hollow member through holes formed in the portions 1) 7) and brush (Z the protruding ends of the said member being expanded or riveted over the parts I) b in the manner of eyelets.

The arrangement of the saddle piece is such that the corrugated portions constitute a kind of spring connection between the end portions and the center portion, so that when the device is secured to the brush and the side portions pushed against the sides thereof the effect is to draw or cause the central portion to vigorously adhere to the surface of the brush adjacent thereto, the aforesaid reduction of electrical resistance resulting as the contact with the brush is established practically with the entire surface of the saddle piece.

The saddle piece or yoke may be formed Patented May 11, 1915.

or provided with a kind of thimble or socket 7", which may be clamped or riveted to the saddle piece as at 9 before the latter is applied or secured to the brush. The conductor h is secured in the thimble or socket 7 and clinched or clamped therein as will be readily understood (see Fig. 4). According to another method, the conductor h may be flattened and passed into or through a correspondingly shaped socket or recessed chamber or passage 7' formed or provided on the saddle piece a, the conductor or cable being clinched or clamped in the said flattened socket. The chamber or passage may be constituted by a flattened socket secured. by riveting or otherwise to the under side of the central portion of the saddle or yoke piece as shown clearly in Figs. 5 and 6.

If desired the saddle or yoke piece may be provided with a socket or holder for the cable or conductor by stamping the whole from a single blank (Fig. 7). The blank in this case would be substantially rectangular or oblong and at suitable distances from the extremities b 6 would be corrugated so as to form the spring portions 0 0 (Fig. 8) of the device between which portions 0 c the main portion a is situated as hereinbefore described. At one end and at any desired location therein the blank is formed with a part 70 adapted to constitute the socket or thimble 70 (Fig. 8) for the reception of the cable or conductor h, the socket being clinched about the end of the cable or conductor. The saddle or yoke piece may be produced in such a manner as to present at any desired point a lug claw or socket for the attachment of the cable or conductor.

The arrangements described above are Copies of this patent may be obtained for given by way of example; it will, however, be understood that the details dimensions and the like may be subjected to variations without in any way departing from the essential features of the invention.

What I claim and desire to secure by Letters Patent of the United States is 1. I11 a brush or collector for electrical machines, a yoke comprising end portions, a central portion and corrugations on the said central portion formed normal to the surface of the said central portion and located at the junction thereof with the end portions.

2. In a brush or collector for electrical machines, a saddle piece comprising end portions and a central portion, corrugations on the said central portion formed normal to the surface of the said central portion and located at the junction thereof with the end portions and a socket for receiving and securing the electrical conductor.

3. In a brush or collector for electrical machines, a saddle piece comprising end portions and a central portion, ribs on the said central portion formed normal to the surface of the said central portion and located at the junction thereof with the end portions, a socket for receiving and securing the electrical conductor and means for securing the saddle piece to the brush or collector.

In testimony whereof I aifix my signature in presence of two witnesses.

EUGENE GINDRE.

Witnesses:

ENRIQUE BAER, HANSON G. CoXn.

Washington, D. 0'. 

